EP2271530A2 - Multi-circuit electrohydraulic motor vehicle brake system and method for operating the same - Google Patents

Multi-circuit electrohydraulic motor vehicle brake system and method for operating the same

Info

Publication number
EP2271530A2
EP2271530A2 EP09734396A EP09734396A EP2271530A2 EP 2271530 A2 EP2271530 A2 EP 2271530A2 EP 09734396 A EP09734396 A EP 09734396A EP 09734396 A EP09734396 A EP 09734396A EP 2271530 A2 EP2271530 A2 EP 2271530A2
Authority
EP
European Patent Office
Prior art keywords
ecu
unit
esc
epb
brake system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09734396A
Other languages
German (de)
French (fr)
Other versions
EP2271530B1 (en
EP2271530B2 (en
Inventor
Heinz-Anton Schneider
Bernhard Schmittner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive Technologies GmbH
Original Assignee
Continental Teves AG and Co OHG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP2271530A2 publication Critical patent/EP2271530A2/en
Publication of EP2271530B1 publication Critical patent/EP2271530B1/en
Application granted granted Critical
Publication of EP2271530B2 publication Critical patent/EP2271530B2/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/58—Combined or convertible systems
    • B60T13/588—Combined or convertible systems both fluid and mechanical assistance or drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/741—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/60—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers
    • G06F7/70—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers using stochastic pulse trains, i.e. randomly occurring pulses the average pulse rates of which represent numbers

Definitions

  • the invention relates to a multi-circuit electrohydraulic motor vehicle brake system comprising a plurality of calipers with hydraulically actuated actuators, which are organized in a plurality of hydraulic brake circuits, and hydraulically connected to an electronically controlled unit comprising an electronic unit and a hydraulic unit comprising a motor-pump unit for hydraulic power supply, and wherein the hydraulically actuated actuators are either driver-actuated by hydraulic actuating means, and / or actuated by the hydraulic unit driver independently, in particular by an electronic stability program (ESC), and wherein at least some of the brake calipers, in particular for actuating or releasing a parking brake action, in addition or separately having electromechanical actuators, wherein at least one electrical power source is electrically connected to the electronic unit, the electrical Supply from the motor-pump unit is used.
  • ESC electronic stability program
  • braking system with electromechanical actuators is in addition to the e- lektronischen stability program - and the associated ESC control unit (ESC-ECU) - a separate EPB control electronics (EPB-ECU) for the supply and control of electromechanical Actuators provided.
  • the EPB control electronics is placed separately in a housing at a separate location of the motor vehicle. Each of the two control electronics is connected to an electrical power source.
  • a network topology network usually a CAN bus system
  • Driver-initiated actuation is provided by a man-machine interface connected to the EPB-ECU.
  • the function is usually such that the EPB control unit reads a parking brake actuation request and the electromechanical actuators (EPB actuators) - which are usually designed as reversible electric gear motors - independently supplied as a function of the driver's request, so either operated in the sense of a parking brake or dissolves.
  • EPB actuators electromechanical actuators
  • the known brake system causes a great effort both in a brake system manufacturer and in a motor vehicle manufacturer. This is due in particular to the fact that the separate hardware must be manufactured, assembled and finally installed in a motor vehicle. This also causes a considerable amount of cabling for the vehicle manufacturer.
  • the invention consists in rationalizing the separate EPB electronic unit by virtue of an already existing ESC Electronic unit is connected via at least two separate electrical supply lines to the electromechanical actuators, and that these ESC
  • Electronic unit has at least one electronic switching means to electrically supply the electromechanically actuated Akuatoren.
  • the total cost of producing the brake system is reduced, and reduces the wiring effort.
  • a particular advantage of the invention is achieved in particular in cases in which the electric current source provides a comparatively low voltage, wherein the rationalization of a separate EPB control device contributes to the advantageous effects.
  • the improved inventive cost structure of the invention even makes it possible to use the proposed brake system in the subcompact class or lower middle class vehicles.
  • Fig. 2 shows a brake system according to the invention, and 3 Details of the brake system according to FIG. 2 for comparison with the known system according to FIG. 1.
  • FIG. 2 shows a multi-circuit, electro-hydraulically actuated motor vehicle brake system 1 shows.
  • This comprises a plurality of calipers 2-5 with hydraulically actuated actuators, which are organized in several hydraulic brake circuits, and with an electronically controlled unit 6 comprising an electronic unit (EPB + ESC-ECU) and a hydraulic unit (HCU) containing a motor-pumping -Aggregat and electro-hydraulic valves for hydraulic power supply, hydraulically connected.
  • the hydraulically actuated actuators are actuated by a hydraulic actuating means 7 via hydraulic lines 8,9 beforehand, and the unit 6 is in this context basically an electronically controlled braking torque distribution (EBD) for the calipers 2-5 available.
  • ELD electronically controlled braking torque distribution
  • the brake calipers 2-5 are driver-independently by the unit 6, in particular by an electronic stability program (ESC), operable.
  • ESC electronic stability program
  • at least some of the brake calipers 2-5, in particular for actuating or releasing a parking brake action based on a parking brake request additionally or separately electromechanical actuators 10, 11 with high efficiency.
  • the electromechanical actuators 10, 11 may be provided in connection with a disk brake, or act on a drum brake, which are each preferably arranged on a rear axle. Even with other friction or locking mechanisms, which serve for setting vehicle wheels, the invention can be applied.
  • at least one electric current source 14 is electrically connected the electronic unit ECU connected. The same connection is the basic electrical supply from the unit 6 and the connected consumers.
  • the electronic unit EPB + ESC-ECU is connected to the electromechanical actuators 10, 11 via at least two separate electrical supply lines 12, 13. Furthermore, the electronic unit EPB + ESC-ECU has at least one electrical switching means for electrically reversibly supplying the electromechanically actuatable actuators 10, 11. It is understood that when using three-phase AC drives in the range of the actuators 10,11 three supply lines can be provided without departing from the gist of the invention.
  • Said switching means may additionally comprise integrated means for reversing at least one of the electromechanical actuators 10, 11 in order to release an actuated parking brake function.
  • the specific design of such reversing can be designed differently.
  • relay-type semiconductor switches can be sufficient for simply reversing the current direction in the two supply lines 12, 13.
  • an integration of switching means is preferable, which includes semiconductor switching means in a so-called MOS-FET-H bridge circuit arrangement to enable the Mehrquadranten bloc.
  • At least one additional electrical interface S for example with at least one additional electrical one, is used Plug-in element, for electrical connection to the at least two electrical supply lines 12, 13; 12 s , 13 s .
  • a bus connection COM is provided for integration and communication of the ESC + EPB-ECU within a vehicle network topology. Further connections or connections of actuation sensors 18, 19, wheel rotational sensors, pressure sensors or the like are no longer clear.
  • a man-machine interface 15 in the form of a switch or button and a not explicitly drawn ECU-side integrated switching means in relation to the actuators 10,11 connected in series.
  • an electrical connection line 16 for electrical connection is an electrical connection line 16 between man-machine interface 15 and ECU.
  • line length or wire length are generally defined so that in principle current-carrying components such as in particular so-called busbars or other solid vehicle or chassis components are to be understood with a current-carrying function for the actuators 10,11.
  • At least one predetermined current setpoint is stored in the electronic unit EPB + ESC-ECU, which correlates with a predetermined application force of the electromechanical actuators 10, 11.
  • a maximum actual current requested by an electromechanical actuator 10, 11 is measured or determined in the electronic unit EPB + ESC-ECU at each parking brake actuation.
  • the maximum actual current is compared with the predetermined current setpoint value, and in this way a potential clamping force deficit is determined if the actual current is lower than the current setpoint value.
  • a decision is made in the ECU as to whether and to what extent additional electrohydraulic power is supplied by the unit 6.
  • the formed difference between the current setpoint and the maximum actual current value can be used to a certain extent as characteristic value for the quantification of a clamping force difference in order to be able to quantify a clamping force difference Depending on this information to allow a gradual graduated or regulated commissioning of the unit 6. This makes it possible to put the unit 6 into operation as required, depending on the characteristic value.
  • the clamping force deficit takes place by power control of the unit 6 and / or by pressure control using electronically controllable electrohydraulic valves associated with the hydraulic actuators 2-5.
  • a release operation of the parking brake function is generally carried out without activation of the motor-pump unit 6 thus by reversed actuation of the electromechanical actuator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
  • Braking Arrangements (AREA)
  • Regulating Braking Force (AREA)

Abstract

The invention relates to a multi-circuit electrohydraulic motor vehicle brake system (1), comprising a plurality of calipers (2-5) having hydraulically actuated actuators which are hydraulically connected to an electronically controlled unit (6), said unit comprising an electronic unit ECU and a hydraulic unit HCU, at least some of the calipers (2-5), additionally or separately comprising electromechanical actuators (10, 11) for actuating or releasing a parking brake effect. In order to cut down on electrical interfaces and electronic units in a motor vehicle, the electronic unit EPB+ESC-ECU is connected to the electromechanical actuators (10, 11) via respective two separate electrical supply lines (12, 13), and the electronic unit EPB+ESC-ECU has at least one electrical switching means for supplying the electromechanically actuated actuators (10, 11) with power.

Description

Mehrkreisige elektrohydraulische Kraftfahrzeugbremsanlage und Betriebsverfahren dazuMulti-circuit electrohydraulic motor vehicle brake system and operating method thereto
Die Erfindung betrifft eine mehrkreisige elektrohydraulische Kraftfahrzeugbremsanlage umfassend mehrere Bremssättel mit hydraulisch betätigbaren Aktuatoren, die in mehreren hydraulischen Bremskreisen organisiert sind, und mit einem elektronisch gesteuerten Aggregat umfassend eine Elektronikeinheit und eine Hydraulikeinheit enthaltend ein Motor-Pumpen- Aggregat zur hydraulischen Energieversorgung, hydraulisch verbunden sind, und wobei die hydraulisch betätigbaren Aktuatoren entweder durch hydraulische Betätigungsmittel fahrerinitiiert betätigbar sind, und/oder durch die Hydraulikeinheit fahrerunabhängig insbesondere durch ein elektronisches Stabilitätsprogramm (ESC) betätigbar sind, und wobei wenigstens einige der Bremssättel, insbesondere zum Betätigen oder Lösen einer Feststellbremswirkung, zusätzlich oder gesondert elektromechanische Aktuatoren aufweisen, wobei wenigstens eine elektrische Stromquelle elektrisch mit der Elektronikeinheit verbunden ist, die der elektrischen Versorgung vom Motor-Pumpen-Aggregat dient.The invention relates to a multi-circuit electrohydraulic motor vehicle brake system comprising a plurality of calipers with hydraulically actuated actuators, which are organized in a plurality of hydraulic brake circuits, and hydraulically connected to an electronically controlled unit comprising an electronic unit and a hydraulic unit comprising a motor-pump unit for hydraulic power supply, and wherein the hydraulically actuated actuators are either driver-actuated by hydraulic actuating means, and / or actuated by the hydraulic unit driver independently, in particular by an electronic stability program (ESC), and wherein at least some of the brake calipers, in particular for actuating or releasing a parking brake action, in addition or separately having electromechanical actuators, wherein at least one electrical power source is electrically connected to the electronic unit, the electrical Supply from the motor-pump unit is used.
Bei einem bereits in Serie gefertigten, vorbekannten, Bremssystem mit elektromechanischen Aktuatoren ist außer dem e- lektronischen Stabilitätsprogramm - und dem zugehörigen ESC- Steuergerät (ESC-ECU) - eine gesonderte EPB-Steuerelektronik (EPB-ECU) für die Versorgung und Regelung der elektromechanischen Aktuatoren vorgesehen. Die EPB-Steuerelektronik ist gesondert in einem Gehäuse an einem gesonderten Ort des Kraftfahrzeugs platziert. Jede der beiden Steuerelektroniken ist mit einer elektrischen Stromquelle verbunden. Zur Kommu- nikation dient ein Verbund einer Netzwerktopologie (üblicherweise ein CAN-Bussystem) in das die ESC-ECU eingebunden ist. Daneben bestehen mehrere elektrische Verbindungs- oder Versorgungsleitungen zwischen der EPB-Steuerelektronik und den elektromechanischen Aktuatoren. Zur fahrerinitiierten Betätigung dient eine Mensch-Maschine-Schnittstelle, die mit der EPB-ECU verbunden ist.In a previously manufactured, previously known, braking system with electromechanical actuators is in addition to the e- lektronischen stability program - and the associated ESC control unit (ESC-ECU) - a separate EPB control electronics (EPB-ECU) for the supply and control of electromechanical Actuators provided. The EPB control electronics is placed separately in a housing at a separate location of the motor vehicle. Each of the two control electronics is connected to an electrical power source. To the communi- nication is a network topology network (usually a CAN bus system) in which the ESC-ECU is integrated. In addition, there are several electrical connection or supply lines between the EPB control electronics and the electromechanical actuators. Driver-initiated actuation is provided by a man-machine interface connected to the EPB-ECU.
Die Funktion ist üblicherweise so, dass das EPB-Steuergerät einen Feststellbremsbetätigungswunsch einliest und die e- lektromechanischen Aktuatoren (EPB-Aktuatoren) - die üblicherweise als reversierbare elektrische Getriebemotoren ausgebildet sind - unabhängig voneinander in Abhängigkeit des Fahrerwunsches versorgt, also entweder im Sinne einer Feststellbremswirkung betätigt oder löst.The function is usually such that the EPB control unit reads a parking brake actuation request and the electromechanical actuators (EPB actuators) - which are usually designed as reversible electric gear motors - independently supplied as a function of the driver's request, so either operated in the sense of a parking brake or dissolves.
Das bekannte Bremssystem verursacht sowohl bei einem Bremssystemhersteller als auch bei einem Kraftfahrzeughersteller einen hohen Aufwand. Dies liegt insbesondere darin begründet, dass die gesonderte Hardware hergestellt, montiert und schließlich in einem Kraftfahrzeug installiert werden muss. Dies verursacht auch einen erheblichen Verkabelungsaufwand beim Fahrzeughersteller.The known brake system causes a great effort both in a brake system manufacturer and in a motor vehicle manufacturer. This is due in particular to the fact that the separate hardware must be manufactured, assembled and finally installed in a motor vehicle. This also causes a considerable amount of cabling for the vehicle manufacturer.
Es ist eine Aufgabe der vorliegenden Erfindung, den Aufwand für eine elektromechanische Feststellbremsfunktion zu senken, und gleichzeitig eine zuverlässige Ansteuerung der e- lektromechanischen Aktuatoren zu ermöglichen.It is an object of the present invention to reduce the cost of an electromechanical parking brake function, and at the same time to enable reliable control of the e- lektromechanischen actuators.
Die Aufgabe wird erfindungsgemäß mit sämtlichen Merkmalen vom Patentanspruch 1 gelöst. Die Erfindung besteht im Prinzip darin, die gesonderte EPB-Elektronikeinheit dadurch zu rationalisieren, dass eine ohnehin vorhandene ESC- Elektronikeinheit über jeweils wenigstens zwei gesonderte elektrische Versorgungsleitungen mit den elektromechanischen Aktuatoren verbunden ist, und dass diese ESC-The object is achieved with all features of claim 1. In principle, the invention consists in rationalizing the separate EPB electronic unit by virtue of an already existing ESC Electronic unit is connected via at least two separate electrical supply lines to the electromechanical actuators, and that these ESC
Elektronikeinheit wenigstens ein elektronisches Schaltmittel aufweist, um die elektromechanisch betätigbaren Akuatoren elektrisch zu versorgen. Durch die Erfindung wird der Gesamtaufwand zur Herstellung des Bremssystems reduziert, und der Verkabelungsaufwand reduziert. Ein besonderer Vorteil der Erfindung wird insbesondere in Fällen erzielt, in denen die elektrische Stromquelle ein vergleichsweise niedrige Spannung zur Verfügung stellt, wobei die Rationalisierung eines gesonderten EPB-Steuergerätes zu den vorteilhaften Wirkungen beiträgt.Electronic unit has at least one electronic switching means to electrically supply the electromechanically actuated Akuatoren. By the invention, the total cost of producing the brake system is reduced, and reduces the wiring effort. A particular advantage of the invention is achieved in particular in cases in which the electric current source provides a comparatively low voltage, wherein the rationalization of a separate EPB control device contributes to the advantageous effects.
In Weiterbildung der Erfindung ist auch vorgesehen, elektro- mechanische Aktuatoren mit höchstem Wirkungsgrad einzusetzen, so dass auch diese vergleichsweise wenig Strom zur Erzielung der geforderten Spannkräfte anfordern.In a further development of the invention, it is also provided to use electromechanical actuators with the highest degree of efficiency, so that these also require comparatively little power to achieve the required clamping forces.
Vorteilhafterweise wird es durch die verbesserte, erfindungsgemäße Kostenstruktur der Erfindung sogar ermöglicht, das vorgeschlagene Bremssystem in der Kleinwagenklasse oder den Kraftfahrzeugen einer unteren Mittelklasse einzusetzen.Advantageously, the improved inventive cost structure of the invention even makes it possible to use the proposed brake system in the subcompact class or lower middle class vehicles.
Weitere Einzelheiten der Erfindung gehen aus Unteransprüchen im Zusammenhang mit der Beschreibung anhand der Zeichnung hervor. In der Zeichnung zeigt jeweils stark schematisch:Further details of the invention will become apparent from dependent claims in connection with the description with reference to the drawings. In the drawing shows each very schematically:
Fig. 1 ein vorbekanntes Bremssystem,1 shows a previously known brake system,
Fig. 2 ein Bremssystem nach der Erfindung, und Fig. 3 Einzelheiten vom Bremssystems gemäß Fig. 2 zum Vergleich mit dem bekannten System nach Fig. 1.Fig. 2 shows a brake system according to the invention, and 3 Details of the brake system according to FIG. 2 for comparison with the known system according to FIG. 1.
Aus der Fig. 2 geht eine mehrkreisige, elektrohydraulisch betätigbare Kraftfahrzeugbremsanlage 1 hervor. Diese umfasst mehrere Bremssättel 2-5 mit hydraulisch betätigbaren Aktua- toren, die in mehreren hydraulischen Bremskreisen organisiert sind, und mit einem elektronisch gesteuerten Aggregat 6 umfassend eine Elektronikeinheit (EPB+ESC-ECU) und eine Hydraulikeinheit (HCU) enthaltend ein Motor-Pumpen-Aggregat sowie elektrohydraulische Ventile zur hydraulischen Energieversorgung, hydraulisch verbunden sind. Dabei sind die hydraulisch betätigbaren Aktuatoren durch ein hydraulisches Betätigungsmittel 7 über durchgehende Hydraulikleitungen 8,9 fahrerinitiiert betätigbar, und das Aggregat 6 stellt in diesem Zusammenhang grundsätzlich eine elektronisch geregelte Bremsmomentenverteilung (EBD) für die Bremssättel 2-5 zur Verfügung. Eine weitere Funktion besteht darin, dass die Bremssättel 2-5 fahrerunabhängig durch das Aggregat 6, insbesondere durch ein elektronisches Stabilitätsprogramm (ESC) , betätigbar sind. Um weitere elektronische Assistenzfunktion zu ermöglichen, weisen wenigstens einige der Bremssättel 2-5, insbesondere zum Betätigen oder Lösen einer Feststellbremswirkung auf Grundlage von einem Parkbremswunsch, zusätzlich oder gesondert elektromechanische Aktuatoren 10, 11 mit hohem Wirkungsgrad auf. Die elektromechani- schen Aktuatoren 10,11 können im Zusammenhang mit einer Scheibenbremse vorgesehen sein, oder auf eine Trommelbremse einwirken, die jeweils bevorzugt an einer Hinterachse angeordnet sind. Auch bei anderweitigen Reib- oder Rastmechanismen, die zum Festsetzen von Fahrzeugrädern dienen, kann die Erfindung angewendet werden. Zur elektrischen Versorgung ist wenigstens eine elektrische Stromquelle 14 elektrisch mit der Elektronikeinheit ECU verbunden. Dieselbe Verbindung dient der grundsätzlichen elektrischen Versorgung vom Aggregat 6 sowie der daran angeschlossenen Verbraucher. Die E- lektronikeinheit EPB+ESC-ECU ist über jeweils wenigstens zwei gesonderte elektrische Versorgungsleitungen 12,13 mit den elektromechanischen Aktuatoren 10,11 verbunden. Weiterhin verfügt die Elektronikeinheit EPB+ESC-ECU über wenigstens ein elektrisches Schaltmittel, um die elektromechanisch betätigbaren Akuatoren 10,11 elektrisch reversierbar zu versorgen. Es versteht sich, dass bei Verwendung von dreiphasigen Drehstromantrieben im Bereich der Aktuatoren 10,11 drei Versorgungsleitungen vorgesehen sein können, ohne den Kern der Erfindung zu verlassen.From Fig. 2 shows a multi-circuit, electro-hydraulically actuated motor vehicle brake system 1 shows. This comprises a plurality of calipers 2-5 with hydraulically actuated actuators, which are organized in several hydraulic brake circuits, and with an electronically controlled unit 6 comprising an electronic unit (EPB + ESC-ECU) and a hydraulic unit (HCU) containing a motor-pumping -Aggregat and electro-hydraulic valves for hydraulic power supply, hydraulically connected. In this case, the hydraulically actuated actuators are actuated by a hydraulic actuating means 7 via hydraulic lines 8,9 fahrerinitiiert, and the unit 6 is in this context basically an electronically controlled braking torque distribution (EBD) for the calipers 2-5 available. Another function is that the brake calipers 2-5 are driver-independently by the unit 6, in particular by an electronic stability program (ESC), operable. In order to enable further electronic assistance function, at least some of the brake calipers 2-5, in particular for actuating or releasing a parking brake action based on a parking brake request, additionally or separately electromechanical actuators 10, 11 with high efficiency. The electromechanical actuators 10, 11 may be provided in connection with a disk brake, or act on a drum brake, which are each preferably arranged on a rear axle. Even with other friction or locking mechanisms, which serve for setting vehicle wheels, the invention can be applied. For electrical supply, at least one electric current source 14 is electrically connected the electronic unit ECU connected. The same connection is the basic electrical supply from the unit 6 and the connected consumers. The electronic unit EPB + ESC-ECU is connected to the electromechanical actuators 10, 11 via at least two separate electrical supply lines 12, 13. Furthermore, the electronic unit EPB + ESC-ECU has at least one electrical switching means for electrically reversibly supplying the electromechanically actuatable actuators 10, 11. It is understood that when using three-phase AC drives in the range of the actuators 10,11 three supply lines can be provided without departing from the gist of the invention.
Das genannte Schaltmittel kann zusätzlich integrierte Mittel zum Reversieren von wenigstens einem der elektromechanischen Aktuator 10,11 aufweisen, um eine betätigte Feststellbremsfunktion zu lösen. Die konkrete Ausgestaltung derartiger Reversiermittel kann unterschiedlich gestaltet sein. Bei Verwendung von einem Gleichstrom-Getriebemotor im Bereich der Aktuatoren 10,11 können relaisartig wirkende Halbleiterschalter zum einfachen Umpolen der Stromrichtung in den beiden Versorgungsleitungen 12,13 ausreichen. Insbesondere bei Verwendung von mehrphasigen, insbesondere bürstenlosen Gleichstrommotoren ist dagegen eine Integration von Schaltmitteln zu bevorzugen, die Halbleiterschaltmittel in einer sogenannten MOS-FET-H-Brückenschaltungsanordnung enthält, um den Mehrquadrantenbetrieb zu ermöglichen.Said switching means may additionally comprise integrated means for reversing at least one of the electromechanical actuators 10, 11 in order to release an actuated parking brake function. The specific design of such reversing can be designed differently. When using a DC gear motor in the area of the actuators 10, 11, relay-type semiconductor switches can be sufficient for simply reversing the current direction in the two supply lines 12, 13. In particular, when using polyphase, in particular brushless DC motors on the other hand, an integration of switching means is preferable, which includes semiconductor switching means in a so-called MOS-FET-H bridge circuit arrangement to enable the Mehrquadrantenbetrieb.
Zur Verbindung der Elektronikeinheit EPB+ESC-ECU mit deren Peripherie wie insbesondere den Aktuatoren 10,12 dient wenigstens eine zusätzliche elektrische Schnittstelle S, beispielsweise mit wenigstens einem zusätzlichen elektrischen Steckelement, zur elektrischen Verbindung mit den wenigstens zwei elektrischen Versorgungsleitungen 12, 13; 12 s , 13 s . Es ist ein Busanschluss COM zur Integration und Kommunikation der ESC+EPB-ECU innerhalb einer Fahrzeugnetzwerktopologie vorgesehen. Weiterere Anschlüsse oder Verbindungen von Betätigungssensoren 18,19, Raddrehsensoren, Drucksensoren oder ähnliches mehr sind nicht verdeutlich.For connecting the electronic unit EPB + ESC-ECU with its periphery, in particular the actuators 10, 12, at least one additional electrical interface S, for example with at least one additional electrical one, is used Plug-in element, for electrical connection to the at least two electrical supply lines 12, 13; 12 s , 13 s . A bus connection COM is provided for integration and communication of the ESC + EPB-ECU within a vehicle network topology. Further connections or connections of actuation sensors 18, 19, wheel rotational sensors, pressure sensors or the like are no longer clear.
In weiterer bevorzugter Ausgestaltung der Erfindung sind eine Mensch-Maschine-Schnittstelle 15 in Gestalt von einem Schalter oder Taster und ein nicht explizit gezeichnetes ECU-seitig integriertes Schaltmittel in Relation zu den Ak- tuatoren 10,11 in Serie geschaltet. Zur elektrischen Anbindung dient eine elektrische Verbindungsleitung 16 zwischen Mensch-Maschine-Schnittstelle 15 und ECU.In a further preferred embodiment of the invention, a man-machine interface 15 in the form of a switch or button and a not explicitly drawn ECU-side integrated switching means in relation to the actuators 10,11 connected in series. For electrical connection is an electrical connection line 16 between man-machine interface 15 and ECU.
Obwohl es aus der schematischen Fig.2 nicht detailliert in dieser Form hervorgeht, ist es bei einer vorteilhaften Gestaltung zur Minimierung von Leitungslängen und daraus resultierender elektrischer Leitungswiderstände vorteilhaft, wenn die Elektronikeinheit EPB+ESC-ECU und die Stromquelle 14 in einem gemeinsamen Einbauraum, wie insbesondere in einem Motorraum oder Kofferraum eines Kraftfahrzeugs, verhältnismäßig nahe beieinander angeordnet sind, so dass die Verbindung 17 verhältnismäßig kurz gehalten werden kann. Insgesamt betrachtet kann als grundsätzliche Richtlinie für die Bemessung sämtlicher elektrischer Leitungslängen des Systems dienen, dass ein Quotient aus der Länge einer längsten Versorgungsleitung 12,13 einerseits, und der Länge einer elektrischen Verbindung 17 zwischen elektrischer Stromquelle 14 und Elektronikeinheit EPB+ESC-ECU andererseits mindestens etwa 2 oder mehr beträgt. Besonders bevorzugt wird ein Quotient zwischen etwa 3 bis 10 angestrebt, wobei auch zur prinzi- piellen Minderung elektrischer Widerstände prinzipiell eine geringe Einzeldrahtlänge angestrebt wird. Die Begriffe Leitungslänge oder Drahtlänge sind generell so definiert, dass darunter prinzipiell stromführende Bauteile wie insbesondere sogenannte Stromschienen oder auch sonstige feste Fahrzeugoder Chassisbauteile mit einer Stromführungsfunktion für die Aktuatoren 10,11 zu verstehen sind.Although it does not emerge from the schematic Fig.2 in detail in this form, it is advantageous in an advantageous design for minimizing cable lengths and resulting electrical line resistance, when the electronic unit EPB + ESC-ECU and the power source 14 in a common installation space, such as Especially in an engine compartment or trunk of a motor vehicle, are arranged relatively close to each other, so that the connection 17 can be kept relatively short. Overall, as a basic rule for the design of all electrical line lengths of the system serve that a quotient of the length of a longest supply line 12,13 on the one hand, and the length of an electrical connection 17 between the electric power source 14 and electronic unit EPB + ESC-ECU on the other hand at least is about 2 or more. Particular preference is given to a quotient of between about 3 and 10, whereby the principle of In principle, a small individual wire length is aimed at in order to reduce the electrical resistances. The terms line length or wire length are generally defined so that in principle current-carrying components such as in particular so-called busbars or other solid vehicle or chassis components are to be understood with a current-carrying function for the actuators 10,11.
Aus den Figuren sind die Unterschiede in den Einzelheiten einer erfindungsgemäßen Bremsanlage gemäß Fig. 2,3 im Vergleich mit einer vorbekannten Bremsanlage nach Fig.l ersichtlich .From the figures, the differences in the details of a brake system according to the invention shown in FIG. 2.3 in comparison with a prior art brake system according to Fig.l can be seen.
Für den Betrieb des Bremssystems wird zusätzlich folgende Funktionalität vorgeschlagen. Prinzipiell ist in der Elektronikeinheit EPB+ESC-ECU zumindest ein vorgegebener Stromsollwert hinterlegt ist, der mit einer vorgegebenen Zuspann- kraft der elektromechanischen Aktuatoren 10,11 korreliert. Zusätzlich wird in der Elektronikeinheit EPB+ESC-ECU bei jeder Parkbremsbetätigung ein von einem elektromechanischen Aktuator 10,11 angeforderter, maximaler Iststrom gemessen oder ermittelt. In einem nachfolgenden Verfahrensschritt wird der maximale Iststrom mit dem vorgegebenen Stromsollwert verglichen, und auf diese Weise ein eventuelles Spannkraftdefizit ermittelt, falls der Iststrom geringer als der Stromsollwert ausfällt. Auf dieser Grundlage wird in der ECU eine Entscheidung gefällt, ob und in welchem Umfang eine zusätzliche elektrohydraulische Energieversorgung durch das Aggregat 6 vollzogen wird.For the operation of the brake system, the following functionality is additionally proposed. In principle, at least one predetermined current setpoint is stored in the electronic unit EPB + ESC-ECU, which correlates with a predetermined application force of the electromechanical actuators 10, 11. In addition, a maximum actual current requested by an electromechanical actuator 10, 11 is measured or determined in the electronic unit EPB + ESC-ECU at each parking brake actuation. In a subsequent method step, the maximum actual current is compared with the predetermined current setpoint value, and in this way a potential clamping force deficit is determined if the actual current is lower than the current setpoint value. On this basis, a decision is made in the ECU as to whether and to what extent additional electrohydraulic power is supplied by the unit 6.
Die gebildetet Differenz zwischen Stromsollwert und maximalem Iststromwert kann gewissermaßen als Kennwert zur Quantifizierung einer Spannkraftdifferenz verwendet werden, um in Abhängigkeit von dieser Information eine graduell abgestufte oder geregelte Inbetriebnahme des Aggregates 6 zu ermöglichen. Dadurch wird es ermöglicht, das Aggregat 6 in Abhängigkeit von dem Kennwert nach Bedarf in Betrieb zu nehmen. In weiterhin bevorzugter Gestaltung dieser Funktion kann es vorgesehen sein, dass das Spannkraftdefizit durch Leistungsregelung von dem Aggregat 6 und / oder durch Druckregelung unter Verwendung von elektronisch regelbarer elekrohydrauli- scher Ventile erfolgt, die den hydraulischen Aktuatoren 2-5 zugeordnet sind.The formed difference between the current setpoint and the maximum actual current value can be used to a certain extent as characteristic value for the quantification of a clamping force difference in order to be able to quantify a clamping force difference Depending on this information to allow a gradual graduated or regulated commissioning of the unit 6. This makes it possible to put the unit 6 into operation as required, depending on the characteristic value. In a further preferred embodiment of this function, it can be provided that the clamping force deficit takes place by power control of the unit 6 and / or by pressure control using electronically controllable electrohydraulic valves associated with the hydraulic actuators 2-5.
Ein Lösevorgang der Feststellbremsfunktion erfolgt generell ohne Aktivierung des Motor-Pumpen-Aggregats 6 also durch reversierte Betätigung vom elektromechanischen Aktuator. A release operation of the parking brake function is generally carried out without activation of the motor-pump unit 6 thus by reversed actuation of the electromechanical actuator.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Kraftfahrzeugbremsanlage1 motor vehicle brake system
2 Bremssattel2 caliper
3 Bremssattel3 caliper
4 Bremssattel4 caliper
5 Bremssattel5 caliper
6 Aggregat6 aggregate
7 hydraulische Betätigungsmittel7 hydraulic actuators
8 Hydraulikleitung8 hydraulic line
9 Hydraulikleitung9 hydraulic line
10 elektromechanischer Aktuator10 electromechanical actuator
11 elektromechanischer Aktuator11 electromechanical actuator
12 Versorgungsleitung12 supply line
13 Versorgungsleitung13 supply line
14 Stromquelle14 power source
15 Mensch-Maschine-Schnittstelle15 human-machine interface
16 Verbindungsleitung16 connection line
17 Verbindung 18, 19 Sensor17 connection 18, 19 sensor
ECU ElektronikeinheitECU electronic unit
HCU HydraulikeinheitHCU hydraulic unit
S SchnittstelleS interface
VR Vorn RechtsFront right
VL Vorn LinksVL Front left
HR Hinten RechtsHR rear right
HL Hinten LinksHL back left
COM BusanschlussCOM bus connection
ESC Elektronisches StabilitätsprogrammESC Electronic Stability Program
EPB Elektrische Parkbremse EPB electric parking brake

Claims

Patentansprüche claims
1. Mehrkreisige elektrohydraulische Kraftfahrzeugbremsanlage umfassend mehrere Bremssättel (2-5) mit hydraulisch betätigbaren Aktuatoren, die in mehreren hydraulischen Bremskreisen organisiert sind, und mit einem elektronisch gesteuerten Aggregat (6) umfassend eine Elektronikeinheit1. A multi-circuit electrohydraulic motor vehicle brake system comprising a plurality of calipers (2-5) with hydraulically actuated actuators, which are organized in a plurality of hydraulic brake circuits, and with an electronically controlled unit (6) comprising an electronic unit
(EPB+ESC-ECU) und eine Hydraulikeinheit (HCU) aufweisend ein Motor-Pumpen-Aggregat zur hydraulischen Energieversorgung, hydraulisch verbunden sind, und wobei die hydraulisch betätigbaren Aktuatoren durch hydraulische Betätigungsmittel (7) fahrerinitiiert betätigbar sind, und/oder durch das Aggregat (6) fahrerunabhängig betätigbar sind, und wobei wenigstens einige der Bremssättel (2-5), insbesondere zum Betätigen oder Lösen einer Feststellbremswirkung, zusätzlich oder gesondert elektromechanische Aktuatoren (10,11) aufweisen, wobei wenigstens eine elektrische Stromquelle (14) elektrisch mit der Elektronikeinheit(EPB + ESC-ECU) and a hydraulic unit (HCU) comprising a motor-pump unit for hydraulic power supply, are hydraulically connected, and wherein the hydraulically actuated actuators by hydraulic actuating means (7) are driver-actuated, and / or by the unit (6) independently of the driver can be actuated, and wherein at least some of the brake calipers (2-5), in particular for actuating or releasing a parking brake effect, additionally or separately electromechanical actuators (10,11), wherein at least one electrical power source (14) electrically with the electronics unit
(EPB+ESC-ECU) verbunden ist, die der elektrischen Versorgung vom Aggregat (6) dient, und wobei die Elektronikeinheit (EPB+ESC-ECU) über jeweils wenigstens zwei gesonderte elektrische Versorgungsleitungen (12,13) mit den elektro- mechanischen Aktuatoren (10,11) verbunden ist, und dass die Elektronikeinheit (ECU) wenigstens ein elektrisches Schaltmittel aufweist, um die elektromechanisch betätigbaren Akuatoren (10,11) elektrisch zu versorgen.(EPB + ESC-ECU), which serves the electrical supply from the unit (6), and wherein the electronic unit (EPB + ESC-ECU) via at least two separate electrical supply lines (12,13) with the electromechanical actuators (10, 11), and in that the electronic unit (ECU) has at least one electrical switching means for electrically supplying the electromechanically actuatable actuators (10, 11).
2. Mehrkreisige Kraftfahrzeugbremsanlage nach Anspruch 1, dadurch gekennzeichnet, dass das elektrische Schaltmittel zusätzlich wenigstens ein integriertes Mittel zum Reversieren von den elektromechanischen Aktuatoren (10,11) aufweist, um eine Feststellbremsfunktion zu lösen. 2. Multi-circuit automotive brake system according to claim 1, characterized in that the electrical switching means additionally comprises at least one integrated means for reversing the electromechanical actuators (10,11) to solve a parking brake function.
3. Mehrkreisige Kraftfahrzeugbremsanlage nach Anspruch 1, dadurch gekennzeichnet, dass jedes Schaltmittel in der E- lektronikeinheit (EPB+ESC-ECU) integriert vorgesehen ist, und wenigstens einen Halbleiterschalter und/oder eine MOS- FET-Brückenschaltung enthält.3. Multi-circuit automotive brake system according to claim 1, characterized in that each switching means in the electronic unit (EPB + ESC-ECU) is integrated, and includes at least one semiconductor switch and / or a MOS-FET bridge circuit.
4. Mehrkreisige Kraftfahrzeugbremsanlage nach Anspruch 1, dadurch gekennzeichnet, dass die Elektronikeinheit4. Multi-circuit automotive brake system according to claim 1, characterized in that the electronic unit
(EPB+ESC-ECU) wenigstens eine zusätzliche elektrische Schnittstelle (S) , wie insbesondere wenigstens ein zusätzliches elektrisches Steckelement, zur elektrischen Verbindung mit den elektrischen Versorgungsleitungen (12,13) aufweist .(EPB + ESC-ECU) at least one additional electrical interface (S), in particular at least one additional electrical plug-in element, for electrical connection to the electrical supply lines (12,13).
5. Mehrkreisige Kraftfahrzeugbremsanlage nach Anspruch 1, dadurch gekennzeichnet, dass die Elektronikeinheit5. Multi-circuit automotive brake system according to claim 1, characterized in that the electronic unit
(EPB+ESC-ECU) eine zusätzliche Schnittstelle zu einer Mensch-Maschine-Schnittstelle (15), insbesondere zu einem gesonderten Schalter und/oder Taster, zum Betätigen oder Lösen einer Feststellbremswirkung aufweist, so dass Mensch-Maschine-Schnittstelle (15) und Schaltmittel in Serie geschaltet sind.(EPB + ESC-ECU) has an additional interface to a man-machine interface (15), in particular to a separate switch and / or button, for actuating or releasing a parking brake effect, so that man-machine interface (15) and Switching means are connected in series.
6. Mehrkreisige Kraftfahrzeugbremsanlage nach Anspruch 1, dadurch gekennzeichnet, dass die Elektronikeinheit6. Multi-circuit automotive brake system according to claim 1, characterized in that the electronic unit
(EPB+ESC-ECU) und die Stromquelle (14) gemeinsam in einem gemeinsamen Einbauraum, wie insbesondere in einem Motorraum oder Kofferraum eines Kraftfahrzeugs, angeordnet sind.(EPB + ESC-ECU) and the power source (14) are arranged together in a common installation space, such as in particular in an engine compartment or trunk of a motor vehicle.
7. Mehrkreisige Kraftfahrzeugbremsanlage nach Anspruch 1, dadurch gekennzeichnet, dass ein Quotient aus der Länge einer längsten Versorgungsleitung (12,13) einerseits und der Länge einer elektrischen Verbindung (17) zwischen e- lektrischer Stromquelle (14) und Elektronikeinheit (EPB+ESC-ECU) andererseits mindestens etwa 2 oder mehr beträgt .7. Multi-circuit automotive brake system according to claim 1, characterized in that a quotient of the length of a longest supply line (12,13) on the one hand and On the other hand, the length of an electrical connection (17) between the electric power source (14) and the electronic unit (EPB + ESC-ECU) is at least about 2 or more.
8. Mehrkreisige Kraftfahrzeugbremsanlage nach Anspruch 7, dadurch gekennzeichnet, dass der Quotient zwischen etwa 3 bis 10 beträgt.8. Multi-circuit automotive brake system according to claim 7, characterized in that the quotient is between about 3 to 10.
9. Betriebsverfahren für eine Fahrzeugbremsanlage, insbesondere nach Anspruch 1, dadurch gekennzeichnet, dass in einer Elektronikeinheit (EPB+ESC-ECU) zumindest ein vorgegebener Stromsollwert hinterlegt ist, der mit einer vorgegebenen Zuspannkraft korreliert, dass in der Elektronikeinheit (EPB+ESC-ECU) für jede Parkbremsbetätigung ein von einem elektromechanischen Aktuator (10,11) angeforderter maximaler Iststrom gemessen oder ermittelt wird, dass der maximale Iststrom mit dem vorgegebenen Stromsollwert verglichen wird, um ein Spannkraftdefizit zu ermitteln, und dass ein Aggregat (6) für eine zusätzliche hydraulische Energieversorgung durch die Elektronikeinheit (EPB+ESC- ECU) zusätzlich in Betrieb genommen wird, wenn ein Spann- kraftdefizit ermittelt wurde.9. Operating method for a vehicle brake system, in particular according to claim 1, characterized in that in an electronic unit (EPB + ESC-ECU) at least a predetermined current setpoint is stored, which correlates with a predetermined application force that in the electronic unit (EPB + ESC-ECU ) For each parking brake actuation, a maximum actual current requested by an electromechanical actuator (10, 11) is measured or determined that the maximum actual current is compared with the predetermined current setpoint to determine a clamping force deficit, and that an aggregate (6) for an additional hydraulic Power supply through the electronic unit (EPB + ESC-ECU) is additionally commissioned when a power-supply deficit has been determined.
10. Betriebsverfahren für eine Fahrzeugbremsanlage nach Anspruch 9, dadurch gekennzeichnet, dass in der Elektronikeinheit (EPB+ESC-ECU) eine Differenz zwischen dem vorgegebenen Stromsollwert und dem maximalen Iststromwert gebildet wird, dass die Differenz als Kennwert zur Quantifizierung von einem Spannkraftdefizit vorgesehen ist, und dass das Aggregat (6) in Abhängigkeit von dem Kennwert nach Bedarf in Betrieb genommen wird. 10. operating method for a vehicle brake system according to claim 9, characterized in that in the electronic unit (EPB + ESC-ECU) a difference between the predetermined current setpoint and the maximum actual current value is formed, that the difference is provided as a characteristic value for the quantification of a clamping force deficit and that the unit (6) is commissioned as needed, depending on the characteristic value.
11. Betriebsverfahren für eine Fahrzeugbremsanlage nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass das Spannkraftdefizit durch Leistungsregelung von dem Aggregat (6) und / oder durch Druckregelung unter Verwendung elektronisch regelbarer elekrohydraulischer Ventile des Aggregats (6) abgebaut wird.11. Operating method for a vehicle brake system according to claim 9 or 10, characterized in that the clamping force deficit is reduced by power control of the unit (6) and / or by pressure control using electronically controlled electro-hydraulic valves of the unit (6).
12. Betriebsverfahren für eine Fahrzeugbremsanlage nach einem der Ansprüche 9 - 11, dadurch gekennzeichnet, dass ein Lösevorgang nach einer Feststellbremsfunktion, ohne hydraulische Energieversorgung durch das Aggregat (6), durch reversierte Betätigung vom elektromechanischen Aktu- ator (10,11) erfolgt. 12. Operating method for a vehicle brake system according to one of claims 9 - 11, characterized in that a release operation after a parking brake function, without hydraulic power supply through the unit (6), by reversed actuation of the electromechanical actuator Actuator (10,11).
EP09734396.6A 2008-04-24 2009-04-23 Multiple-circuit electro-hydraulic brake system for motor vehicle and operating method for such a system Active EP2271530B2 (en)

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PCT/EP2009/054901 WO2009130283A2 (en) 2008-04-24 2009-04-23 Multi-circuit electrohydraulic motor vehicle brake system and method for operating the same

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US20110144878A1 (en) 2011-06-16
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US8645039B2 (en) 2014-02-04
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